mozillaDisable official Firefox branding (icons, name) which
are not binary-redistributable according to upstream.Fine-tune custom compiler
optimizations (-Os, -O0, -O1, -O2, -O3)Allow Gecko Media Plugins (binary blobs) to be automatically
downloaded and kept up-to-date in user profilesUse gstreamer:0.10 instead of gstreamer:1 for media supportEnable or disable jemalloc3 (forced-on when supported prior to 38.0)Prevent sdk and headers from being installedAdd support for profile-guided optimization using gcc-4.5,
for faster binaries. This option will double the compile time.Use the system-wide x11-libs/cairo
instead of bundled.Use the system-wide dev-libs/icu
instead of bundled.Use the system-wide media-libs/libjpeg-turbo
instead of bundled.Use the system-wide media-libs/libvpx
instead of bundled.Use the system-wide dev-db/sqlite
installation with secure-delete enabledEnable EGL provider